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IEEE1588 synchronous accuracy test device based on networking LXI measurement and control system

A technology of synchronization accuracy and test device, which is applied in time division multiplexing systems, electrical components, multiplexing communications, etc. System working parameters, etc.

Inactive Publication Date: 2012-01-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a network-based measurement and control LXI system to solve the problems that the existing IEEE1588 synchronization system cannot measure the statistical characteristics of the system for a long time, cannot intuitively reflect the synchronization accuracy, and cannot flexibly configure the working parameters of the synchronization system IEEE1588 Synchronization Accuracy Test Device

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  • IEEE1588 synchronous accuracy test device based on networking LXI measurement and control system
  • IEEE1588 synchronous accuracy test device based on networking LXI measurement and control system
  • IEEE1588 synchronous accuracy test device based on networking LXI measurement and control system

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specific Embodiment approach 1

[0015] Specific implementation mode one, see figure 1 This embodiment will be described. The IEEE1588 synchronization accuracy testing device based on the networked measurement and control LXI system described in this embodiment is composed of a computer 1, a network connection device 2, a master clock node 3 and a plurality of slave clock nodes 4, wherein the master clock node 3 and each The slave clock node 4 is connected to the network connection device 2 through an Ethernet cable, the network connection device 2 is connected to the computer 1 through an Ethernet cable, and the CVI interface subsystem is embedded in the computer 1, wherein:

[0016] The CVI interface subsystem is used to read the system configuration file, and obtain the total number of master clock nodes 3 and slave clock nodes 4 in the system; it is also used to apply for system resources according to the total number, and communicate with master clock nodes 3, Each slave clock node 4 establishes a TCP c...

specific Embodiment approach 2

[0037] Specific embodiment 2. In this embodiment, on the basis of the IEEE1588 synchronization accuracy test device based on the networked measurement and control LXI system described in the specific embodiment 1, the slave clock node 4 is also used to obtain clock offset information. The effective bit of the clock offset information is 1; it is also used to judge whether the effective bit of the clock offset information is 1; when the effective bit of the clock offset information is 1, the clock offset information is sent to the CVI interface subsystem, and the The effective bit of the clock offset information is 0, and when the effective bit of the clock offset information is not 1, the slave clock node continues to wait for judgment.

[0038] The workflow of slave clock node 4 in this embodiment: see Figure 5 As shown, after the third step C3, there is also a step C3-1, the first step C3-1: at each synchronization, the effective position of the clock offset information is ...

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Abstract

The invention provides an IEEE 1588 synchronous accuracy test device based on networking LXI measurement and control system. The invention relates to an IEEE1588 synchronous accuracy test system and solves the problem that the prior synchronous system cannot test the statistical property of the system in a long time, cannot directly reflect the synchronous accuracy and cannot flexibly configure the working parameters of the synchronous system. A CVI interface subsystem in a computer transmits the synchronous parameter to each clock node according to user needs; after receiving a configuration command, each clock node stops the running IEEE1588 protocol stack thread; the IEEE1588 protocol stack thread is reconstructed according to the configured parameter, and clock offset information is transmitted from the clock node to the CVI interface subsystem via the network; and the CVI interface subsystem displays the clock offset information in the form of curve and data. The invention is used for testing the accurate time synchronous accuracy in the LXI measurement and control system.

Description

technical field [0001] The invention relates to an IEEE1588 synchronous accuracy test system. Background technique [0002] IEEE1588 precision time synchronization protocol is a time synchronization mechanism stipulated to overcome the lack of real-time performance of Ethernet. Its main principle is to synchronize the time of all nodes in the network, and an accurate time source periodically corrects and synchronizes the clocks of all nodes in the network. The protocol itself cannot improve the real-time performance of the measurement and control system, but it can determine and adjust events to achieve more precise time intervals, so as to obtain real-time behavior. This protocol can synchronize the clocks of devices in standard Ethernet or other distributed bus systems using multicast technology at sub-microsecond level or even tens of nanoseconds. [0003] It is a very important problem to the test of an IEEE1588 synchronous system, and the test scheme used in the prior...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04J3/14
Inventor 刘兆庆彭宇乔立岩罗清华王彪
Owner HARBIN INST OF TECH